diff --git a/gprMax/contexts.py b/gprMax/contexts.py
index 0881a422..0a0eb202 100644
--- a/gprMax/contexts.py
+++ b/gprMax/contexts.py
@@ -83,6 +83,7 @@ class Context:
                 model.solve(solver)
 
             del model
+            del solver
             del G
 
         self.tsimend = timer()